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High Efficiency, Low Distortion Boundary Conduction Mode Boost PFCs for Different Power Ranges

Marvi, Mohammad | 2014

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 45997 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Fotowat-Ahmadi, Ali
  7. Abstract:
  8. In this thesis, new boundary conduction mode boost PFCs are proposed and implemented for different power levels according to the characteristics and requirements of each power level. For medium power applications, we have proposed a new zero voltage switching PFC based on a synchronous boost converter which is controllable with conventional boundary conduction mode PFC control ICs without requiring any additional timing adjustment control circuits other than a special high side driver that consists of only low voltage components. Based on mathematical calculations, we have proposed two sipmle circuit solutions to reduce the high level of line current zero crossing distortion in the proposed converter for both voltage mode and current mode control methods. Various Pspice simulations and carried out tests on the built prototypes show not only the zero voltage switching but also the successful reduction of line current distortion to less than 10% which is comparable to conventional PFCs with distortion reduction. We have also proposed a new self oscillating boost PFC for cost sensitive low power applications which achieves low line current distortion. Application of a notch filter in the feedback loop is proposed for eliminating the double line frequency interference in the control loop while keeping the good dynamic response. Moreover, a gain correction circuit is proposed for better stability over a wide range of line voltage and load power levels. The proposed distortion reduction method is utilized in this converter, too. Various simulation and test results of a built prototype show that the proposed self oscillating converter achieves comparable merits with evaluation boards based on commercial ICs at a lower cost. Finally, we have proposed the use of interleaving for extending the power range of the presented zero voltage switching boost PFC to higher levels in future projects. This converter can provide the additional benefit of electrical isolation in a single stage
  9. Keywords:
  10. Total Harmonic Distortion ; Zero Voltage Switching (ZVS) ; Power Factor Correction ; Interleaver ; Boundary Conduction Mode ; Self Oscillating Converter ; Interleaving

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